Sewing machine



Sept. 25, 1934. F. J. McAviNNEY SEWING MACHINE Filed Oct. 8. 1951 Fig. 2.

nvenTor. 25 'F-rdncs Q MC/vhney l Ays.

Patented Sept. Z5, 1934 UNITED STATES PATENT OFFICE SEWING MACHINE Application October 8, 1931, Serial No. 567,563

4 Claims.

' sewing around the ends of the buttonhole and the loopers and looper spreaders are given their operative movements by means of concentric spindles situated axially of the turret and capable of reciprocation in the direction of their length,

each spindle deriving its reciprocating movement from a Vibrating lever.

The connection between each lever and the spindle must be a pivotal connection to allow for swinging movement of the lever and it must also be in the 'nature of a swivel connection to permit` the turning ofthe spindle with the turret as the 'latter turns in sewing around the end of the buttonhole. The present invention relates particularly to a novel connection between the spindle which operates the looper and its actuating lever, and has for its object to provide a novel connection which is simple to manufacture, which is effective in allowing the required pivotal and swivel movement between the connected parts and which can be readily adjusted as wear takes place.

In order to give an understanding of the invention I'have illustrated in the drawing a selected embodiment thereof which will now be described after which the novel features will be' pointed out in the appended claims.

Fig. 1 is a view of the turret of a sewing machine of the general type illustrated in the aboveenentioned patents, 'said figure illustrating my improved connection between the actuating lever and the spindle which actuates the looper spreaders;

Fig. 2 is a sectional view on the line 2--2, Fig. 1;

Fig. 3 is a section on the line 3 3, Fig. 1;

Fig. 4 is a side View of Fig. 1 with a part broken out;

Fig. 5 is a section on the line 5 5, Fig. 1.

In the drawing l indicates generally the turret of a buttonhole sewing machine of the genferal type illustrated in said above-mentioned (Cl. Vfl-104) looper mechanism which coroperates with the upper needle in concatenating the stitches.

The looper mechanism comprises vibrating loopers and looper spreaders, which are not illustrated in Fig. 1 of the drawing since said iigure shows the opposite side of the turret from that on which the loopers and looper spreaders are actuated. It may be said, however, that the loopers and looper spreaders are carried on a looper carrier 2 pivoted to the turret at 3, said carrier being connected by a link 7 to a collar 8 on a spindle 9 extending axially through the turret and` connected at its lower end to an actuating lever 10. Y

The looper spreaders are actuated by an oscillating cam member 6 which is connected by a link 4 to a spindle 5 also situated axially of the turret 1 and reciproca-ble vertically therein. As usual `in devices of this sort the spindle 9 is in the form of a sleeve andthe spindle 5 extends through it axially. The spindle 5 is given its vertical reciprocation in any suitable way.` The lowerrend of the spindle or sleeve 9 is connected to one end oi` and is actuated by a lever 10 which is suitably pivoted tothe` frame as shown at 11, said lever deriving its voscillating movement from some appropriate moving part of the sewing machine.

The present invention relates particularly to the connection between'the spindle 9 and the lever 10. As stated above, said connection must provide the necessary pivotal connection between the spindle 9 and lever 10 as well as allowing the spindle 9 t-oturn about its axis relative to the lever 10 as the turret is turned.

The lever lOis of fixed length and oscillated about a stationary axis 11. It is shown as having a forked end 12 and each arm 13 of thefork 12 is provided 'with an inwardly-directed stud or trunnion14. These trunnions 14 are shown as being formed on the inner ends of studs 15 which are mounted in the arms 13, each stud having fast thereon a collar 16 engaging the inner face oi the arm and having a nut 17 screw threaded to its outer end for locking the stud in place.

The trunnions 14 are connected to the spindle 5 through the medium of a swivel member which is journalled on the trunnions 14 and is mounted on the spindle 9 for turning movement thereabout and bodily movement transverse to the axis thereof, but which is held from movement longitudinally of said axis. This swivel member is shown as comprising the two swivel rings 18 and 19 which are confined between a collar 20 that is rigid with the spindle 9 and a second collar 21 which is adjustably mounted on the spindle. As herein shown the collar 21 is screw threaded to the lower end of the spindle as shown at 22 and said collar is split as indicated at 23, the split portion of the collar carrying a clamping screw 24 by which the collar canbe clamped to the spindle.

Each swivel ring 18, 19 -is formed on the edge thereof which faces the other ring with notches 25 shaped to t the trunnons 14, the notches'- in the two rings being in alignment and each pair of aligned notches thus forming a bearing for the corresponding trunnion.

The swivel rings 18, 19 are thus held between the collars 20, 21 but are free to turn about the spindle, or, in other words, the spindle 9 is free to turn within the rings. Moreover, the interior diameter of each swivel ring is somewhat larger than the exterior diameter of the portion 26 of the spindle on which said rings are mounted so the rings may have a movement transversely of the axis of the spindle.

The connection between the trunnions 14 and the swivel rin-gs' 18, 19 together with the transverse motion which the rings may have provide the necessary pivotal connectionbetween the lever 10 and the sleeve 9 by which the arcuate motion of the trunnions 14' is converted into a straight line motion of the spindle. With this construction thel amplitude of the straight line movement of the spindle corresponds exactly to the vertical component of the amplitude of movement of the trunnions 14 but the' transverse sliding movement of the swivel rings between the collars 2.0 and 21 compensates for the difference in the paths of movement between the trunnions 14 and the spindle. The swivel connection between the rings 18 and 19 and the spindle 9 provides for the necessary free turning movement lof the turret.

The adjustable collar 21 provides means for taking up any wear which may occur between the trunnions 14 and the swivel rings 18, 19 and by this construction it is possible to maintain a tight joint free from loose motion or back lash.

The connection is easily assembled and can be easily adjusted to take up any wear without in any way dismantling the sewing machine.

I. claim:

1. In a device of the class described, the combination with a rotatable spindle reciprocable in the direction of its length, of a forked actuating `lever for reciprocating the spindle, said lever having a trunnion projecting from each arm of its fork, two swivel rings carried by the spindle and adapated to turn thereon but held from movement longitudinally thereof, said rings having aligned notches constituting bearings for the trunnions.

2. In a device of the class described, the combination with a rotatable spindle capable of reciprocating in the direction of its length, said spindle having two collars thereon, one of which is xed and the other of which is adjustable longitudinally of the spindler a pair of swivel rings conned between said collars but capable of turning about the spindle, said rings having aligned notches, and an actuating lever having trunnions finding a bearing in said notches.

3. In a device of the class described, the combination with a spindle rotatable about a fixed axis and capable of reciprocation in an axial direction, of an actuating lever of fixed length oscillating about a stationary axis, and means connecting the ends or said lever with said spindle, said means comprising a two-part annular meinber through which the spindle extends, trunnion members on the lever situated between and' having a pivotal engagement with the two partsv of said annular member, said trunnions. andthe two partsl oi? the annular' member having complemental. cylindrical bearing surfaces, which t and turn on each other, whereby a relative movement between said member and lever is coniined to a relative turning movement about the axis. oi' the cylindrical bearing surfaces, said spindle having two collars adjustable relative to each other between which the two-part annular member is retained and by the adjustment of which a tight nt between the complemental cylindrical bearingv surfaces may be maintained.

43. In a device of the class described, the cornbination with a rotary spindle capable of reciprocating in the direction of its axisv and having two collarsv thereon, adjustable axiallyV relative toI each other, of two swivel rings confined between said collars and through which the spindle extends u;

and in which it is free to rotate, said swivel rings being capable of movement relative to the spindle in a direction transverse to the spindle axis,

direction transversely to the axis thereof,v the adjustment of the collars providing for maintaining a tight t between the complemental cylindrical bearing surfaces.

FRANCIS J. MCAVINNEY. 

